How do I get MIUI to stop killing my background VPN process?

Oct 10, 2013
I live in China, and like a lot of people I use fqrouter2 for a VPN from my phone. It works great.

However, MIUI kills it all the time. I've tried marking it as a no-kill process (pull down on task manager screen) and it has the lock icon, but it doesn't help. How can I fix this problem?